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Light Beam Deflection

IP.com Disclosure Number: IPCOM000096578D
Original Publication Date: 1963-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Harris, TJ: AUTHOR

Abstract

The variation of the refractive index of a generally transparent solid or gaseous medium near an absorption band is used to deflect a light beam. The wavelength of the light beam is matched to the absorption band of the solid or gaseous medium. The medium, e. g., is in the shape of a prism.

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Light Beam Deflection

The variation of the refractive index of a generally transparent solid or gaseous medium near an absorption band is used to deflect a light beam. The wavelength of the light beam is matched to the absorption band of the solid or gaseous medium. The medium, e. g., is in the shape of a prism.

A monochromatic light beam is emitted from light source 1. The beam is directed through prism 2 which is composed of a generally transparent solid or gaseous medium. The emission band of source 1 and the absorption band of prism 2 are closely matched. The amount of deflection obtained and observed on screen 3 is varied by either of two methods. Source 1, in one method, is tuned to change the wavelength of its emission band. Alternately, the absorption band of prism 2 is shifted.

The absorption band of the solid or gaseous medium is shifted by the application of an electric or magnetic field to the medium. An additional technique for shifting the absorption band is available where a semiconductor medium is used. A second light beam is applied to the semiconductor prism in which there is a transfer of photon energy from the second beam to create free charge carriers within the medium. By this transfer of energy the refractive index of the medium and the resulting change of deflection of the light beam occurs.

A side effect to the light deflection mechanism is the modulation of the intensity of the light beam passing through prism 2. This effect is controlle...